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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba572fdf4c72946fde56ae93ce25f4be3f4ea35c3e1725fd7d1c33d5e6efa1c' 
  AND token = 'jHPDTfQwZk/6cdRRgRgwZgUCkKCf3X6fj+6RpzUqMbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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