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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '756805d56f691db6b84621be4ed47dd3f8386eca4a8bd929f2e71ab17e06c7da' 
  AND token = 'be9KDA8U+r4Xq2poTYh0zvJvN3DBqfl0DegljB9M28c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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