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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa64f603d3106f04dc7c6c2abfe65a13c16a868e3050d5e8fe1536ac779c25d' 
  AND token = '/7W80FLPZdBxrnWhOa1P7iECmTLsBLp2BCkCul2icTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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