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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8887dd06044173e25306742e17e5c6ebc3242df4b663c6ba20385a66a5e70d8b' 
  AND token = 'm+i9Qupn2ixBs5JbcuKGnHR6DGJxjBpwTAzM8MOOoec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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