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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6fa52d3c6c2784a094f06126462ca8e0a19419b7e71b15d698bfc3e630e2982' 
  AND token = 'EikiX5hS/Y0zF74iCwcG7owb598bux1bnrXS0dD2Vnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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