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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f358e054eac629b59ca8b1ddc5fe0345c2f0cd78c4be8aaf535adf1ccf58195' 
  AND token = '1Ewb4VtfsAAnXey6KJCU9fgJ9uypOdc5s0fZ78pCchU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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