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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0476b08b33d628ed8209d2f3147980ba0f0b05a7c82dabfa91438f4d00f20260' 
  AND token = 'X7IHs7NM8jdrG1to6uMzNkbM1mC/nfmw4smpLdQGRz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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