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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff577ed0e1f5f53c6b488196df899b6de35e7282de69d31865c24aefad836cd0' 
  AND token = '7l/mnQHxtDn2glpA4Pum4N3v+r5qhhAG80WJnun8vO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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