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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcff466c2506efeb88e9091fcf94f5e1fd4e7309e49f777ce2ba5c1139bfdd94' 
  AND token = 'BxgSWH7xpYrdhQF4fTduDFOFAWGG+43CgULOUtlVSbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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