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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15302019f0d2ddc0ff65902a5d0c63b4c0560cb33e42c1d7cd0ad394cf84c6de' 
  AND token = 'x+Qk9ZbX6HDPosfZ2lJyoAi2kjL52Wzp/0p5qxSqc5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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