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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed2ec5d4782fdf2c17ce37671f3499bbfb02b7b40102fecfeac617fd939322a5' 
  AND token = 'J8Pi0PV9kltF0mL6RarnvZpkLPLcArzC3yJ2kzDskkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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