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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd25900df41f13760e69c47ef46acecc8664f78e4c4a8ce93bbaac2992447fa73' 
  AND token = '/51gQuZ1rC2+3I0u3h7nl9AM+0huOV4hrpmDa3FScEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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