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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc7681e9457555bb21dcfd548e76ba2bb56b3fac276a4854502aa821261e610' 
  AND token = 'BVRyHlhxc08P68AaAadKXGSRYBMvh7Nm+C3S/NTCR0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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