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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b86d69799827458073466bc9d8a17ab0edff6d1ed33a83f35b75a7a2a51e4be' 
  AND token = 'dqKi/OCeLgjafPFIQgoEOKHfrs8gAT32bMjxMb9yaR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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