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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff06a3d3f9c52bf3a267d35933e6a0f4391c06dbe0f4fd1a1047d166079ea98' 
  AND token = 'gj6Lq8G/IcvsHXuoOXiEL9rCL5+XpfjAyfbkPgjP3h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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