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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0bc2f8bd515c7836edc4b65117397bf699bbf66c1f03e4b4b5a8bf9a81a0d3' 
  AND token = 'FureFt7zscVDBiq/+olFXUPikTPMCnWwygFxSfGiB90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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