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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59147d3c3a469c8baf1d650ef95ccfdf469724ceb1a4252fb56e809b7491b820' 
  AND token = 'yNH2E2+JafyMAn0feS2QVGYsit/R2f7b2tAR6dCTBmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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