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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201460e6b53a2a335a17cb7ced87abbb5d1cfab7767cf098e042a232d2619b02' 
  AND token = '8el2n8Pet6ZCkIwbrPo/Admsre8ey4n4DRC/Qy/pY50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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