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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b2a7867a8c8227f3f47eba63518356ffbf41ba2093b0748cf27b9674ec078dc' 
  AND token = 'W+abILY/AqI+fpYtFkJ8pcGw7RFOZ/gb3aYlyZw2kAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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