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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aba827e4938f5d8319cbd5a0ec492ac6374b9fc7b5fdbd254f0de3cd8ea6ac8' 
  AND token = '23HqyahUv4Af5KGvmhSsK8KQn8a8y8+24PI8nzeHC3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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