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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f8629a6b4c6435f3fbcb19f1c4d66bd959f7d84a0d1620b7cbb3ed5e982f989' 
  AND token = 'ek5kk2Zf0zrcaRwzDjNpBnWtZcsOM6ZOpqLR9WpJhBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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