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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '786b0545a3c375fd8a0ab2eaff7a9f19cc5f8a20927db491e3bcd6bdb5bd3160' 
  AND token = '2ttKLAkVmRPkqFG1I5+yr2YJbcM3a5NLLKCKVzY2250=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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