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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068255030408eb028e67c2b6695ce735ac3de65ad9e62e962f5872c41ef394eb' 
  AND token = '/ub5E2XK2Vg0qilcMwstySbwzcIIIQoYywCkX75GSso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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