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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c1aed131c1a659fa5848d7f246d46899d12b756034a40fc7238bcd59c75d09' 
  AND token = 'qIPAM6OGMuLNu7Xc3LSa98yHIOUkP/g3u0jh0EoMTLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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