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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feddcaef3634cce3074f9fec7fb51c244c568e29b46dbb85776b9e8cfb9c28ca' 
  AND token = 'pyh+VU2HW1QQRRXjW75YXoTHFPKLZtOejaeBm43PCH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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