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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62dcb00883a9a88c1f1e9971307282bc20b11c87bb514c507682c9851b2e8a2c' 
  AND token = 'ZCZT8iy/0FiCuRfalscIwTDXoTj3/Y72XZ7m+rJMYXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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