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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f0e2aa4d5aff7e00e14f619430eba9a51ef360ba276ed5b4e6bd58a386daf3' 
  AND token = 'SqeRuuSy7bEBBiIQat1BOyMRzG5AluN+sxYgwAhHEbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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