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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898a02a1658edef9d8dc55def52b4e85e23dd5b84bf5b8283aaab26b067e83be' 
  AND token = 'MUW4kEffMfa80j1D/TfoLPHw/A4XZff6x2sXAXRzdCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}