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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75d8543553f71c740a1126c2a0cddc1335f3fcafec0d6d5d19e1a584a62f24b4' 
  AND token = 'NLnaJfci0eD2viDab8YSAM0+3RSGUoFT+bGcrPvmjQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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