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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d154e1f5decc49071f5397c8bf6d07c8fdc6a06d27eab153a144fb447d0acb' 
  AND token = '4/ZW42Kov5CKjcZnRgKnoWrP0y2bpMtQtpNCoGTjnsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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