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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3b2f0b2d6d27b057324eca1d94873b0f6ab23997608abd4311050109b8b20c5' 
  AND token = 'PvbE/OTi8FeU3mjznVqE030PTD2ISqdG/mVvP4qZw5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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