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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ada56cca8d76066b0d49ab25b662eb8acbea0d6b7779ce00d2c7445f65c5e93' 
  AND token = 'N/AuwmHeMYFKECwmJWgJm3ew+CMMEWr1Y4ZHHJluIBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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