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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f31f8311b4a6ef074abaec4e4f16b167dd5ac0677d0a56d58e60d3a206cd6a' 
  AND token = 'gsWI63zjIY2sVPowFtPcUq/BQ3tY0vpac9Ho5QAuHIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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