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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1bf022acced1666c6a9041927e5fb4eb58a2e87e9a1f89eafba06e6e1d86ef' 
  AND token = 'jgPiGRpYpCyxg7regiGOFnbjaGgf7sYpekzl0PTT1gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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