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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c752637efda66df01f9f7dd73dcb664dcff680347913ce1470c474bc4f0b46' 
  AND token = 'ySA0ySNb9wxG/RpV3Y1Ja38L4s5R8Nm/rIuQm0Pu/Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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