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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7262c415ce4afc97035b1802ef2ab8e3d97b9fae55f659e5d2d5bca47cfb0a5' 
  AND token = 'u2xIn1xJJ1MNtHCQM7zMdTfUcY4bBpw6ueSLu17/N1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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