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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00ad2586a064cbf7dffc3370a02d5f29f67b16b7d7be2e709c2e3aafe416abee' 
  AND token = 'hgu1RCAj0/TRgsm0/SwFR1XuazojfzL+hk25p8ZjIX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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