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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02b937c2ae9276d1def09abc6cf72c08b3f59b3915dc94b3af52cc61a051841' 
  AND token = 'NAx3oZFXyz7jQD/pVPV5QIeb/PCPe0RHahT4ykosWkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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