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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55fdbc6ca09dd5715090fd41ee61a382daa646d48659f70198aa6de447a99aa2' 
  AND token = 'I/cXRvCKSHvgN0OM7Mai2imGFZi364Xpgdm6ISs3Fco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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