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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc6d7beb87e9686567d113de5a31ceeed7521a8706341a8a074d321025e6957b' 
  AND token = '5RVIueT+G+NqVGsaLPCdtzbD3ZHlYK9sPcXpkFzNgLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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