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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87b756856e124fc732dd64cbb38008ac83eccf76c0e2d666a53c7c68af60648' 
  AND token = 'B7MZsTzPMRbH6DXJ1ULF22v5MbqrywW0qG/VCRQS6I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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