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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e75e8a01f1ae348be18bece3125554a7980daade7308fe578c6019f907bdc0b' 
  AND token = '2dqvtp62FW/bjLYlLpuJGFVt0CUq077brnPV9Q0ORyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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