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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2de98a5b4700ce0f96f6be1be982ed69d6bb81f0e3e14ed31bf7e2a7a43f51e' 
  AND token = 'Er2O3WI2P1ZfEFZ/4a2VMi/lTjHTjFJ2kAv5+R1iXCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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