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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760e43fa158e508166a3c2a6878c62a006b0c82e2546ce861b281b40fd26494c' 
  AND token = 'SS4TG18ku5kWWH2JQyhnT8/cNc0BHWT2EFE4JxKLN10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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